Originally Posted by
earlwb
So with a new engine, you can sort of expect that first plug and first engine run to trash the plug.
Yes, always better to use old plugs, even on permanent glow power for break-in and for the first 3-4 tanks, this way you can get more out of expensive G5 and "F" type plugs.
I even run new engines on ignition for 3-4 tanks before replacing the EI with a G5 plug. The G5 works great, I tested it on a good number of engines already.
Anything under 20cc should be seriously considered for a "GGT" conversion, I just picked up a couple of second hand ST G3250's and fitted one with a Walbro carb, the ST G90 and G2300 I converted a while back did well when tested with the G5, I expect this one to do well too but now I have a good few EI's I removed from the smaller gassers that can power the larger glow conversions.